JPS5840079B2 - Matsutojiyobutsuo Genryyoutosuru Hoontouno Seizouhouhou Oyobi Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing a heat insulating cylinder, in which a long heat insulating cylinder is continuously formed and cured by continuously supplying a glass fiber mat impregnated with a thermosetting resin liquid, and the like. It is related to the device.

A glass fiber mat is adhered and impregnated with a thermosetting resin liquid (e.g. phenol resin liquid) or cement slurry, etc. and formed into a cylinder shape, and is used as a heat insulation cylinder (glass wool heat insulation material) for insulation construction of various piping and other equipment. Currently, when manufacturing heat insulating cylinders, glass fiber mats cut to a certain width are used as raw material, so it is not possible to mold them using glass fiber mats. The length of the cylindrical body is naturally limited, and it has been impossible to manufacture an infinitely long cylindrical body.

The present invention has been made in view of the above, and includes a resin liquid,
Alternatively, we have developed a continuous manufacturing method and equipment for heat-retaining cylinders that can be made by winding a band-shaped glass-filled fiber mat impregnated with cement, etc. in a spiral shape onto the surface of a mold pipe, and at the same time curing the molded product and sending it out one after another. It is something.

In addition, what must be especially taken into consideration when manufacturing a heat-retaining cylinder made from glass fiber mat-like material is that the heat-retaining cylinder maintains excellent heat insulation performance as a heat insulating material. It is important to mold and manufacture the cylinder so that its thermal resistance is within the range.

In order to make the thermal resistance of the heat insulating tube as small as possible, it is necessary to make the thermal conductivity of the heat insulating material small and to make the wall thickness of the tube as small as possible, as shown by the following equation.

Here, R: Thermal resistance of the insulation tube (mh'c/Kcal) λ: Thermal conductivity of the insulation material (Kcal/mh℃) rl: Inner radius of the insulation tube (m) γ2: Outer radius of the insulation tube ( 7rL) The thermal conductivity of the glass itself is approximately 0.65 Kcal/m
h'c and dog, but glass fiber mat-like material o, oi
~0, when molded at a low density of 2011/CC, approximately 0
, 06 to 0.03 Kc a l /mh'c, which is extremely small, and the thermal conductivity of the molded product is approximately 92φ of the total volume.
It is dominated by the thermal conductivity of the air that satisfies the above.

In the above density range, as the amount of glass fiber increases per unit volume, the thermal conductivity decreases, but as the amount of glass fiber increases further, heat transfer due to thermal conduction of the glass fiber itself increases. Therefore, the thermal conductivity of the molded product increases.

Considering the above reasons and economic efficiency, the molded product of the thermal insulation cylinder has a density of 0.45 g/cc or more according to JIS standards (practically 0.45 to 0.12 g/cc), and a thickness of 20 to 75 mm. A thickness and a thermal conductivity of less than 0.037 Kcal/mh'c are required.

When molding and curing thick materials with low thermal conductivity, it is difficult to sufficiently harden the resin or cement that is impregnated inside even if the material is heated only from the outside. There were drawbacks such as many molding defects due to adhesion to the surface.

In consideration of these points, the present invention completely prevents delamination due to internal curing failure and molding failure due to inner surface adhesion to the mold pipe by using both internal and external heat treatment when molding the heat insulating cylinder. It is possible to do what is possible.

The present invention will be described in detail below based on embodiments shown in the drawings.

Reference numeral 1 denotes a molded pipe, and this molded pipe 1 has a curing part 3 in which a large number of hot air injection holes 2 are bored on the circumferential surface of about half of the lengthwise direction, and a friction part 4 in the other half. However, as shown in FIG. 3, in this molded pipe 1, the outer peripheral surfaces of the curing portion 3 and the friction portion 4 may be formed to have the same diameter. A pipe whose outer diameter is smaller than the outer diameter of the friction part 4 (see Fig. 4), or a pipe buoy that forms the friction part 4, and a thin pipe that is inserted into the inside of the pipe and has a curing part at the tip. 3' (see Fig. 5).

Reference numeral 5 denotes a pair of pressing rollers disposed in the outer diameter direction of the mold pipe 1, which press and mold the mat-like body 6 of glass fiber (glass wool) wound around the surface of the mold pipe 1. A pointed protrusion 7 is arranged and protrudes from the circumferential surface of 5 in a spiral direction.

8 is a heater inserted through the molded body 61, 9 and y are chain wheels rotatably supported by a frame (not shown), and these chain wheels 9 and 9' are connected to the drive shaft 11 via a chain 10. It is connected to a fixed chain wheel 12.

13 is fixed to a frame (not shown), and the chain wheel 9. A movable gear 14 is meshed with this fixed gear 13, which is located concentrically with g.

This movable gear 14 is fixed to a support shaft 15 that is installed between both chain wheels 9 and 9'.

Reference numeral 16 denotes a worm fixed to the support shaft 15, and this worm 16 is meshed with a worm wheel 18 fixed to one end of the support shaft 17 rotatably supported on the side surface of the chain wheel ring. .

Reference numeral 19 denotes an hourglass-shaped roll fixed to the spindle 17, and as shown in FIG. Each roll 19 is driven by the relationship between the worm and the worm wheel.

That is, since both chain wheels 9, 9' are rotated by rotating the drive shaft 11, each drum roll 19 is rotated in the circumferential direction of the molded body 6'.
The support shaft 15 installed between both chain wheels 92g rotates (
Each drum-shaped roll 19 is rotated in the arrow direction a.

The structure of this embodiment has been described above, and its operation will now be described.

First, a belt-shaped mat-like body 6 is prepared by impregnating a glass fiber mat with a thermosetting synthetic resin liquid, cement slurry, etc.
is supplied from an oblique direction and wound spirally around the friction portion 4 of the mold pipe 1, and the surface of the wound mat-like body 6 is pressed by a pressing roll 5 having a driving force,
The mat-like body 6 is made into a pipe-like molded body DA.

At this time, the mold pipe 1 is rotated at a high speed faster than the rotation of the pressure roll 5, and at the same time, hot air is jetted from the hot air injection hole 2 of the curing section 3.
The inner circumferential surface of the pipe-shaped molded body σ that is wound around the pipe is thermally hardened without coming into close contact with the mold pipe, and the molded body σ is heated by the action of the small spiral protrusions 7 provided on the circumferential surface of the pressure roll 5. It is sent out sequentially while rotating.

The thus-preliminarily formed molded body 6' is passed through a heater 8 and heat-treated from its outer surface to completely harden both the inside and outside. They are drawn out one after another while being shaped into a shape.

As described above, according to the apparatus of the present invention, an unlimitedly long cylindrical object can be continuously molded by supplying a strip-shaped raw material, and the impregnated resin etc. can be completely cured by heating from inside and outside. and the intended purpose can be achieved.

Further, in the above embodiment, the belt-shaped mat body 6 is supplied from one place, but the invention is not limited to this. For example, the belt-shaped mat body 6 can be supplied from two or more directions as shown in FIG. If it is supplied from a single point, thicker cylindrical objects can be continuously molded.

[Brief explanation of the drawing]

The drawings all show embodiments of the device according to the present invention, and FIG. 1 is a side view of the device, FIG. 2 is a perspective view of the cylindrical molding part, FIG. 3 is a perspective view of the mold pipe, and FIG. 5 and 5 are perspective views showing other embodiments of the mold pipe, FIG. 6 is a side view showing the raw material supply state, and FIG. 7 is an explanatory view of the arrangement of molded product drawing rolls. 1... type pipe, 2... hot air injection hole,
3... Cure ring part, 4... Friction part, 3'... Thin pipe, 4'... Pipe, 5... Press roller , 6... Mat-like body, 6'... Molded body, 7... Tip projection, 8... Heater, 92g... Chain wheel, 10...Chain, 11...
... Drive shaft, 12 ... Chain wheel, 1
3...Fixed gear, 14...Movable gear,
15... Support shaft, 16... Worm, 1
7... Support shaft, 18... Worm wheel, 19... Drum shaped roll.

Claims (1)

[Claims] 1. A strip-shaped molding raw material made by impregnating a glass fiber mat with a thermosetting resin liquid or a fluid such as cement slurry is molded into a molded pipe having a curing section at about half of the lengthwise end. A pressing roller that is successively wound in a spiral manner around the circumferential surface, and that is spaced apart so that the outer circumferential surface of the wound mat-like material is parallel to the mold pipe, and that has pointed protrusions arranged at close intervals in the spiral direction of the outer circumferential surface. The molded body is pressed and molded into a cylindrical shape while being sent out, and while this molded body moves forward in sequence toward the tip of the mold pipe, the inner surface is hardened in the curing part, and then the molded body is cured on the outside with a heater. After the surface is heat-treated and thermally cured, the cured molded body is further rolled in the bowing direction of the molded body using a plurality of drum-shaped rolls that are in contact with the outer peripheral surface and arranged in the circumferential direction. At the same time as the drum-shaped roll itself is rotated, it is rotated in the circumferential direction of the molded body to shape it into a perfect cylinder to form a cylindrical molded body. A method for producing a heat-retaining cylinder using a glass fiber mat-like material as a raw material, which is characterized by sequentially drawing out and forming an infinitely long cylindrical body. 2. A mold pipe having a part thereof with a large number of hot air injection holes for heat-treating the inner surface of the cylindrical molded body, and a mold pipe that is spaced parallel to the mold pipe and has pointed protrusions closely spaced in the spiral direction on the outer circumferential surface. - or a plurality of raw material pressing rollers, the mold pipe, a heater for heat-treating the outer surface of the cylindrical molded body formed and sent out by the suppression roller, and further the heater. A plurality of drum-shaped rolls are arranged in contact with the outer peripheral surface of the cylindrical molded body and in the circumferential direction of the cylindrical molded body, and the drum-shaped rolls are rotated in the drawing direction of the molded body and molded at the same time. A manufacturing device for a heat-retaining cylinder made from a glass fiber mat-like material, characterized by comprising a drive mechanism that rotates in the circumferential direction of the body.